question

In the Game Manager, the delete button of the region is designed to can’t delete the last region of a build. You can call the Multiplayer API DeleteBuildRegion to delete the last region from a build. Or you can set the Target Standby and the Maximum (Server Size) as 0.

Besides, it looks like the screenshot you provided shows how to delete the Builds. Since our Game Manager UI has updated since this video published, so the current UI looks different. Now there is no delete button of the build in the [Regions] page. To delete the server builds on the Game Manager, you can navigate to [Game Manager]->[Multiplayer]-[Servers] page, hover over a build line, click the ellipsis on the right side and select [Delete build] in the drop-down menu or call the API DeleteBuild.